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【单选题】
额定电压交流( )kV及以下的应为低压电器设备.器具和材料。A.
1
B.
2
C.
5
D.
10
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反馈参考答案：
举一反三
【单选题】奥氏体晶粒度的影响因素很多，下列叙述中不正确的是（）。
A.
同一种钢加热温度越高奥氏体晶粒越粗大；
B.
相同温度下晶粒随保温时间的延长而变得粗大；
C.
其他条件相同的情况下，加热速度越快奥氏体晶粒越粗大；
D.
本质细晶粒钢，是指晶粒不容易长大的钢。
【简答题】Ancient people had little idea of the nature of the earth’s suce. But if they lived on the seashore, they knew that there was land and sea. People who lived near the sea noticed that there were two...
【单选题】of the land in that district covered with trees and grass.
A.
T wo-fifth; is
B.
Two-fifth; are
C.
Two-fifths; is
D.
Two-fifth s; are
【单选题】— The land in the southwest of China is in great need of ____. — Yes, it hasn ’ t rained for a long time there.
A.
milk
B.
tea
C.
coffee
D.
water
【单选题】— The land in the southwest of China is in great need of _______. — Yes，it hasn’t rained for a long time.
A.
coffee
B.
juice
C.
water
D.
tea
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